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kernel: Add a "nocache" read-write memory section

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Add a "nocache" read-write memory section that is configured to
not be cached. This memory section can be used to perform DMA
transfers when cache coherence issues are not optimal or can not
be solved using cache maintenance operations.

This is currently only supported on ARM Cortex M7 with MPU.

Fixes #2927

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2018-11-07 23:40:43 +01:00 • committed by Andrew Boie
commit 6fd1691b94
9 changed files with 98 additions and 6 deletions
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3
include/linker/sections.h
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@ -56,7 +56,10 @@
#define _CCM_DATA_SECTION_NAME .ccm_data
#define _CCM_BSS_SECTION_NAME .ccm_bss
#define _CCM_NOINIT_SECTION_NAME .ccm_noinit
#endif
#ifdef CONFIG_NOCACHE_MEMORY
#define _NOCACHE_SECTION_NAME nocache
#endif
#include <linker/section_tags.h>